The chinstrap brings out his jaw. I'm not that found of the exposed ears. I mean why would you expose your ears?

So you can hear better?

I suspect it may be a trade off. You can probably have either a good looking helmet or no-chinstrap, but not both. The reason being that making the helmet look good requires giving it enough substance that it needs a chinstrap to hold in place if you want any kind of stuntwork or mobility to happen.